A single stroke recoiless pneumatic air rifle with a consistant 11+ft/lb output that's highly reliable, highly accurate, rugged, very long lasting and light, with a very quiet action (no twangs, clicks or clunks), scope rails and a good silencer, available in .177.
Ideally made by a British manufacturer and priced around £450 - £500.
I know attempts have been made to produce these before, but they haven't survived on the market so they can't have fulfilled all the above.
Must be do-able nowadays, surely?
Don't tell 'em y'name, Pike!